Laserfiche WebLink
<br /> <br />2. The pond embankments range in height from 6 to 10 feet. We <br />performed stability analysis for several conditions on a representative <br />model of a 10-foot high embankment. Factors of safety in excess of <br />1.3 were found for the conditions modeled. The lowest calculated <br />value was 1.7. Due to the relatively low height of permanent water <br />storage, seepage and piping below the embankment are not <br />considered to be significant concerns. <br />3. Construction recommendations including suitable and unsuitable <br />materials types, and placement and compaction recommendations are <br />presented in the report. The embankment for Pond 013 is located in <br />a moderately sloping area. We recommend benching of the ground <br />surface prior to fill placement for this embankment location. <br />Embankment fill should be moisture conditioned to within 2 percent of <br />optimum moisture content and compacted at least 95 percent of <br />standard Proctor maximum dry density (ASTM D 696). Fill placement <br />and compaction should be observed and tested by a qualified <br />geotechnical engineering firm. <br />4. Monitoring and inspection should be performed by qualified individuals <br />as required by State regulations. <br /> <br />PROJECT DESCRIPTION <br />The general location of the proposed sedimentation ponds is shown on Fig. <br />• <br />1. More details for each proposed pond locations/configuration are shown on Figs. <br />2 through 7. We anticipate the ponds will be generally constructed by excavation <br />from the upper elevations of the pond area, with this material being used to construct <br />embankments along the lower side of the pond. The height of the embankments <br />ranges from 6 to 10 feet. All of the embankments have a crest width of 14 feet. The <br />side slopes of the embankments are planned at 2.5:1 (horizontal:vertical). Table A <br />shows general dimensions for the six embankments under consideration. <br />LORENCITO COAL COMPANY, LLC <br />SMALL SEDIMENTATION EMBANKMENTS <br />CTLlT 26,559 <br />2 <br />